GG 



PS T CHE. 



[April 1S91. 



show the usual green color and mark- 

 ings of the females. The earliest ap- 

 pearance at Moline is August 22. 



*7i. Mermiria bivittata Serville. 

 Very rare if it occurs at all in the state. 

 Mr. Thomas thinks he has seen one 

 specimen taken within this limit. It 

 has been taken at Omaha, Nebraska, by 

 Mr. Lawrence Brunei- so that its occur- 

 rence here is very probable. 



72. Traxalis brevicomis Linn. This 

 is a southern species but it extends as 

 as far north as Urbana, Illinois, where I 

 am told by Mr. C. A. Hart it has been 

 frequently taken .at the electric light, 

 as many as seven or eight having been 

 taken in one e ening, August sixteenth 



Lestes eurinus Say. — This species ap- 

 pears never to have been taken since Harris's 

 day, who obtained his specimens on the bor- 

 ders of ponds in Milton, Mass., in 1826. The 

 only notices which have been published since 

 the description by Say, in 1839, nave been 

 based solely on his text. The accompanying 

 description is from the type (a J 1 ) in the 

 Harris collection of the Boston Society of 

 Natural History. It is a true Lestes. 



Greenish blue above, yellowish beneath. 

 Head bronze blue above, yellow beneath ; 

 apex .of clypeus, labrum, sides of mandibles, 

 and front of face very pale greenish blue, 

 glistening. Thorax bright blue above with 

 violaceous reflections and with dorsal and 

 lateral sutures yellowish brown; sides of 

 thorax blue, the side of mesothorax with a 

 biserrate lemon yellow spot occupying lower 

 posterior third, that of metathorax yel- 

 low with an oblique triangular fuscous stripe ; 

 base of all the legs, and under surface of 

 femora (especially of posterior pair) yellow; 

 upper surface of femora, lower surface of 

 tibiae and tarsi brownish green; upper sur- 

 face of tibiae fuscous; wings subhjaline or 

 very slightly flavescent, pterostigma black; 



iSSS. The frequent occurrence of a rare 

 species at the electric light is more 

 remarkable since it is of very rare occur- 

 rence for the commonest species of 

 Acrididae to visit a light. 



73. Arcyptera llneata Scudder. A 

 very rare form in the northern part 

 of the state. I have taken a few speci- 

 mens on the Iowa side of the Mississippi 

 opposite Watertown. This is pretty 

 certainly the species from the northern 

 part of the state, which Thomas says 

 he saw for too short a time to certainly 

 identify. In his list it is given as 

 Stctheophyma {Arcyptera) gracilis? 

 Scudd. The single specimen in my 

 collection was captured August 9. 



abdominal segments 1-5, above blue, 6-10 

 blackish green ; beneath very pale fuscous, 

 more dusky posteriorly, their apices black- 

 ish; superior appendages forcipated, beneath 

 bidentate interiorly; the first tooth at the 

 extremity of the basal fourth sharply pointed, 

 directed posteriorly ; the second, just beyond 

 the middle, depressed, laminate, denticulate, 

 directed toward that of the opposite appen- 

 dage (inferior appendages lost) ; thirteen 

 postcubital cross nervules on right, fifteen 

 on left fore wing. 



Length (inc. forceps) 46 mm. ; alar ex- 

 panse, 59 mm.; length of pterostigma, 2.5 

 mm. Samuel H. Scudder. 



Hemidiptera haeckelii. — Entomologists 

 who would derive the Diptera from the Hemi- 

 ptera, if any such exist, will be delighted to 

 find in the last number of the Jenaische 

 zeitschrift fur naturwissenschaft (bd. 25, 

 heft. 1 & 2, 1890, p. 13-15) a description of 

 what purports to be a "zwischenform" con- 

 necting these two widely separated orders.' 

 Dr. N. Leon figures and gives a brief-de- 

 scription of an insect taken by Prof. Ernst 

 Ilaeckel in Ceylon together with species of 



